The identity of the heroine is a passing agent, and her true identity will be revealed slowly during the plot. As for the identity of the male protagonist, he is the emperor who is feared by everyone in the world of immortality. However, due to the heroine, he was completely darkened and transformed into a ruthless and cold-blooded demon. After that, the male protagonist who became the demon has been guarding the reincarnated heroine until...
(1V1, this is a story about time travel but it almost turned into a story about time travel and immortality.)
Intention: